Patent GB-1112670-A (GB)
Title: High speed selective printing device for office machines and data processing equipments
IPC: B41J9/04
Filed: 1965-12-24
Abstract: 1,112,670. Selective printing. ING.C. OLIVETTI & C. S.p.A. 24 Dec., 1965 [2 Jan., 1965], No. 54777/65. Heading B6F. Electric signal type-selecting input arrangements; type-wheel machines; hammer impression arrangements.- A selective printer incorporated in a calculating machine comprises a continuously rotating type carrier 3, Fig. 1, provided with a plurality of rows of numerical characters disposed over an arc of 180 degrees and a single hammer 18 mounted on a continuously traversable carriage 13 driven by a lead screw 41, whereby the hammer is moved one letter space for each rotation of the type carrier 3 and is so dimensioned as to print only one character in every column during its movement along the printing line. Printing is effected by applying a printing starting signal to an electromagnet 64 which is energized for a short period to attract its armature 59 so as to displace its associated pivotally mounted lever 58 in the direction of cam 54, whereby a pin mounted on the lever 58 engages one of the apertures 56, Fig. 3, in the cam. Thereafter a pin 65 supported on the lever 58 and co-operating with a dog 66 on a slide 67, which is reciprocated by a cam 72 fast on the lead screw 41 rocks the pin 65 and thereby the cam 54 counterclockwise. Rocking of the cam 54 pivots a universal bar 47 counterclockwise to cause a projection 39 pivotally mounted on the hammer carriage 13 to engage the lead screw 41 and move the carriage 13 leftwards in readiness for printing of a line. Simultaneously a lug 91 (Fig. 4) on the arm 49 of the bail 47 rocks a bellcrank 88 whose lug 94 operates a switch 96 to prevent sending of another printing signal, whilst a lug 92 on the arm 49 sets a switch 93 which renders effective the clock signals generated by the head 11, Fig. 1, when a ferromagnetic element 10 which precedes the " 0 " numeral passes the head 11. Other clock signals representative of corresponding numerals are generated by ferromagnetic elements 9, which jointly with the element 10 are mounted on a disc 8 supported at one end of shaft 4. The bellcrank 88 when operated by the arm 47 is retained in its actuated position by lug 86, Fig. 3, of a lever 83, which is rocked to underlie arm 87 of bellcrank 88 when the carriage 13 is traversed by the lead screw 41 and lug 81, Fig. 1, fast with a shaft 16 is not obturated by a lug 17 of bracket 35 on the carriage 13. The numerals are printed sequentially in coincidence with the clock signals generated by the head 11 which also energize an electromagnet 27, Fig. 3, whose armature 22 rocks the hammer 18 for impression. A spring 19 restores the hammer during the period when the blank portion of the type carrier 3 passes the hammer. Carriage-return arrangements; noise sup - pression arrangements.-When the highest significant order of a number has been printed the calculating machine sends a signal representing an algebraic sum, which in addition to being printed causes also the electromagnet 64 to be energized so as to rock the cam 54, Fig. 3, in the manner described above and restore the universal bar 47 which disengages the projection 39 from the lead screw 41 whereupon a carriage return spring 34 restores the carriage to its rest position at the right-hand side of the machine. The, lug 17 pivots the lug 81 to thereby release the bell crank 88, which resets the printing signal switch 96, whilst the clock signal switch 93 is reset by the restoration of the universal bar 47. Return stroke of the carriage 13 is controlled by a centrifugal brake 31. Return of carriage 13 may be effected automatically when carriage 13 reaches the left end of its stroke in that by striking a pin 84, Fig. 1, the shaft 16 and slide 77 are displaced leftwardly, so as to cause the pin 57 on lever 58 to engage the cam 54 which is rocked when the pin 65 on the lever 58 is pivoted by the dog 66 of the reciprocating slide 67. Line-spacing arrangements; web feeding and guiding arrangements.-Recording web 97 is supplied from a roll 98, Fig. 3, and passed over the type-carrier 3, at the ends of which are mounted loose knurled wheels 102 co-operating with resiliently biased wheels 103 to form a feeding nip for the recording web. Knurled wheels 102 are drivingly associated with gear-wheels 110, one of which co-operates with a line-spacing lug 117 (Fig. 5) integral with a pawl 118, one end of which is arcuate and spring biased into contact with a hub 109 interconnecting wheels 102 and gear-wheels 110, and the other end of which is provided with recesses 132, 133, the latter of which engages a lug 134 on the reciprocating slide 67 to line space the gear-wheel 110 during its rightward displacement. Pawl is reset by inclined walls of recess 132 which glide up the top ends of levers 122, 127, when slide 67 is reciprocated leftwards. Line spacing is initiated at the beginning of the printing by lug 129 on universal bar 47 which pivots the lever 127 (Fig. 6) anticlockwise forcing pawl 118 of the surface 121 on to surface 131, so that when bar 47 is restored at end of printing line, the spring 119 (Fig. 5), which biases the pawl 118 against the hub 109, forces the pawl between the contiguous surfaces of the levers 122, 127, the latter of which is restored by spring 128, into engagement with the lug 134. Line-spacing key-actions.-Line spacing may be initiated manually by depression of key 139 (Fig. 5) whose stem 138 (Fig. 6) is provided with a lug 137 which on engagement with a lug 136 on the lever 122, rocks the latter thereby permitting the pawl 118 to engage the lug 134 on the reciprocating slide 67 and repeated line spacing is effected until the key 139 is released.